OK. I think I've got this.
So, the Japanese Meters (like the one in my N80), will be balanced for 3200K. European meters will be balanced for 5500K. Natural lighting tends to be about 5500K. So, given the same picture, it looks like the European meters will read about 1 stop less exposure than the Japanese meters (it was never stated directly which way the difference was to I've inferred it from otehr comments).
Now, why the difference? I did notice when I was working in a photo lab that the oriental customers almost universally preferred their prints lighter by 1-2 stops than I would have preferred. Could that be it?